248 results about "Dragonet" patented technology

An efficient breeding method for crayfish in fresh water of a rice field is disclosed. The efficient breeding method for the crayfish in the fresh water of the rice field comprises the steps of: selecting the rice field which is sufficient in water source, convenient in irrigation and drainage, strong in water-retaining capacity, not dry when meeting with heavenly stems and not submerged by floods and has a good ecological environment, no pollution source around, fertile soil and a substrate natural structure; placing grass carp summer flower, bighead carp summer flower and field snails after the young crayfish is placed; filling decayed cow dung every half a month at a filling amount of 50-100 kg per each mu; checking submerged plant mow and filling aquatic plant every half a month; filling animal fodder such as fish meat and meat of spiral shells of 2-4 kg per each mu every week.

The invention discloses an efficient feed breeding method for chicken lobsters. According to the method, a paddy field having the characteristics of sufficient water source, convenience in irrigation and drainage, high water retaining capacity, drought resistance on dry weather, flooding resistance, good ecological environment, freeness from surrounding pollution source, rich soil and natural substrate structure is selected, and ctenopharyngodon idellus, aristichthys nobilis fries, river snails and the like are put into the paddy field after juvenile chicken lobsters are stocked. As proved by comparison, by adding a compound microorganism fertilizer, rapid growth of chicken lobsters can be promoted, the content of EPA (Eicosapntemacnioc Acid) is increased, and diseases of chicken lobsters are reduced, chicken lobsters died due to diseases are reduced; and meanwhile, beneficial microorganisms in water bodies are increased, and the final quality is improved.

The invention discloses a polyculture method of river crabs, crayfish and mandarin fish. The polyculture method of the river crabs, the crayfish and the mandarin fish comprises the following steps of building a pool, cleaning and disinfecting the pool, planting aquatic plants, putting snails into the pool, disinfecting seeds, putting the seeds into the pool, feeding fodder, regulating and controlling the water quality of the pool, and catching products. According to the polyculture method of the river crabs, the crayfish and the mandarin fish, which is provided by the invention, the effective control on the kinds, the total quantity and the specification of cultivation can be realized, the cultivation cost is reduced, and the economical benefit of the cultivation is increased.

The invention belongs to the technical field of aquaculture, in particular to a method for ecological breeding of crawfish in the rice field. The method for ecological breeding of crawfish in the rice field has the following beneficial effects: excavating groined field ditches after rice harvesting, arranging an anti-escape net and aeration equipment around the rice field to obtain an aquatic breeding farm for crawfish; scattering quicklime to disinfect and planting waterweeds to measure water temperature and throwing parent shrimps; throwing mixed feeds to the field ditches per day, scattering farmyard manures to the field ditches after breeding for some time and planting fresh water plants, marketing crawfish after growing up, finally, throwing young crawfish after transplanting seedlings of rice and throwing mixed feeds, completely catching adult crawfish before rice harvesting, and keeping crawfish that are not caught as seed crawfish in a pond for natural reproduction and carrying out rotation planting in a circular manner. The method for ecological breeding of crawfish in the rice field has the following beneficial effects: the method can be used for dual purposes in one field so that income is raised; meanwhile, artificial feed and medicament are not used so that nutritional ingredients of crawfish are improved; and no environmental contamination of aquatic water is caused.

The invention discloses a method for planting rice in a Procambarus clarkii culture pond. The method comprises the steps of carrying out standard pond reconstruction, carrying out pre-culture preparation, carrying out juvenile Procambarus clarkii stocking, carrying out high-straw rice transplanting, carrying out planting and culturing management, carrying out commercial Procambarus clarkii culturing and fishery and carrying out high-straw rice harvesting. According to the method, rice planting is introduced to aquaculture ponds firstly, the Procambarus clarkii culture pond is subjected to simple engineering reconstruction, Procambarus clarkii, rice and water plants are organically combined so as to realize the mutualism of the Procambarus clarkii and the rice, the Procambarus clarkii is used for carrying out soil loosening and insect damage removing on the rice, and the rice absorbs nutrient elements, such as N and P, in water, so that the water for culture is purified, habitation and shelter sites are provided for the Procambarus clarkii, a good growth environment is created for the Procambarus clarkii, and the quality of the Procambarus clarkii is improved. The method disclosed by the invention is simple and convenient in operation and is suitable for being popularized to shrimp and crab culture ponds, the whole course of production has no need of medication, produced rice and Procambarus clarkii are high in quality, and the economic benefit increased per mu is more than 1,500 RMB, so that the method has great social and economic benefits.

The invention relates to a crayfish rice continuous-cropping breeding and planting technology. The invention has the special technical key points that: the rice field, which has good water quality, sufficient water and no pollution source and is convenient to irrigate and drain, is selected to breed crayfish; the area of the rice field is properly over dozens of acres; feeding ditches are excavated in ridges; a crayfish rice continuous-cropping breeding and planting mode comprises three modes of throwing seed crayfish, throwing ovigerous crayfish and throwing young crayfish; according to the requirements of the three modes, the seed crayfish or the young crayfish are thrown sufficiently in one step; when a large number of young crayfish move, artificial feed such as minced fillet, scrambled screw clam meat and the like are fed properly; in winter, crayfish enter caves to live through the winter; in March of the next year, the crayfish come out again after water temperature rises again, wherein the water temperature is controlled by a method for adjusting water depth and is controlled to be 20 to 30 DEG C commonly; and the crayfish are caught at the end of March to at the end of May every year. By the technology, the rice field can be utilized completely to artificially cultivate the crayfish; the problem that the rice field leaves unused in rainy seasons of winter and spring is solved; and a wide prospect for farmers to achieve prosperity is achieved.

The invention discloses a method for culturing crayfishes. The method includes the steps of 1, preparing a pond; 2, breeding young crayfishes, wherein 25 kilograms to 30 kilograms of young crayfishes are bred in per mu of the pond; 3, throwing feed, wherein animal feed is mainly thrown in April and May, vegetable feed is mainly thrown in June, July and August, and animal feed is mainly thrown in the period from the late September to the catching period; 4, controlling the water quality, wherein 15 cm to 20 cm of water is added per week; 5, preventing and treating diseases, wherein pond water is sterilized through quick lime at regular intervals, and the use amount for one-meter-depth water is 15 kilograms per mu; 6, carrying out catching at the right moment, wherein after the crayfishes lay eggs, when young crayfishes grow to have the weight ranging from 40 g to 50 g, the adult crayfishes are caught. According to the method for culturing the crayfishes, as the links such as the pond, the young crayfish breeding number, the feeding amount, the feeding time, the water quality, disease preventing and treatment and catching are reasonably controlled, injuries of natural enemies, diseases and the like to the crayfishes can be greatly reduced, the survival rate of the crayfishes is high, the growth speed is high, and the yield is high.

The invention discloses a rice and chicken lobster continuous mixing planting and breeding method capable of stabilizing the grain income and increasing the fishery income. The method includes: digging circular furrows in a rice field, increasing the height and the width of ridges, reinforcing the ridges, and additionally arranging escape-proof facilities; transplanting Ceratophyllum demersum and Alternanthera philoxeroides in the circular furrows after water in the rice field is disinfected; transplanting Hydrilla verticillata, Potamogeton maackianus and Potamogeton wrightii in the rice field outside the circular furrows; performing a rice and chicken lobster continuous cultivation mode, breeding chicken lobsters from the last ten days of September or the first ten days of October to the first ten days of June of the secnd year after the rice is harvested; raising rice seedlings in a special field from May to the first ten days of June, and planting the rice from the middle ten days of June to the last ten days of September; using a ground cage to catch the chicken lobsters from May to the first ten days of June, and leaving a part of the chicken lobsters to be cultivated with the rice; putting parent chicken lobsters into the circular furrows of the rice field from the middle ten days of August to the first ten days of September; applying a fermentative organic fertilizer and putting Bellamya quadrata from the last ten days of February and the last ten days of May; putting Elodea nuttallii from March to June; feeding the chicken lobsters with a compound fodder at 18 p.m. to 19 p.m. every day; controlling the water level all through the year; controlling diseases of the chicken lobsters; catching the chicken lobsters; and planting the rice.

The invention discloses a rice field ecological crawfish culture method, and relates to the crawfish culture technical field; the culture method comprises the following steps: rice field altering; rice field disinfection and fertilization; bait mixotrophic culture; shrimp seed inputting and feeding; field management; adult shrimp catching. In rice field altering, ridges are heightened, and smooth stop plates are arranged, thus preventing crawfish from escaping; a space is reserved in the rice field so as to grow crawfish favorable waterweeds; in addition, crawfish favorable fries and loach seeds are polycultured in the field. The method culture the crawfish in the rice field so as to simultaneously obtain aquatic product culture incomes, thus increasing farmer incomes; the crawfish in the rice field can capture grasshopper insects and aquatic biology; the rice spikes can serve as crawfish foods, thus improving crawfish mouthfeel.

The invention discloses a method for cultivating crawfishes. The method comprises the following steps of (1) choosing of cultivation pools, (2) preliminary treatment of the cultivation pools, (3) water planting, (4) algae planting, (5) throwing of crawfish seedlings and (6) fodder throwing and later period management. According to the method, through reasonable arrangement of treatment of the cultivation pools, algae planting and water plating, throwing of the crawfish seedlings, fodder feeding and later period management, the oxygen content of water is effectively guaranteed in the growing process of the crawfish seedlings, a good ecological environment is established, meanwhile, the probability of disease infection of the crawfishes is effectively lowered, the survival rate of the crawfishes is improved, and therefore the economic benefits are improved.

The invention discloses a green and efficient comprehensive shrimp-rice breeding method which comprises the following steps: (1) carrying out field engineering transformation and optimization; (2) carrying out rice field weeding and sterilization; (3) planting and maintaining aquatic plants; (4) carrying out early-stage natural feed biological culture; (5) launching shrimp fries and seed shrimps,harvesting commercial shrimps, and carrying out breeding circulation; (6) carrying out feeding and management; (7) carrying out water quality management and disease and insect prevention and control;(8) carrying out comprehensive planting and breeding management, and the like. By adopting the method, a first batch of shrimp fries are harvested in March to April, a first batch of commercial shrimps can be harvested in April to June, a second batch of commercial shrimps can be harvested in August to September, a batch of high-quality rice can be harvested at the middle and last ten days of October, the limit that sufficient mutualism of shrimps and rice cannot be achieved by using a conventional breeding mode can be avoided, meanwhile, ecological resources can be utilized, propagation and breeding of large-scale cray fries ahead of time can be promoted, the problems that a conventional shrimp-rice co-existence or continuous breeding is low in yield benefit and high in death rate can beavoided, a rice field ecological system is sufficiently utilized for comprehensive breeding and green production, and the benefits and the quality of cray and rice can be improved.

A rice and lobster co-culture method includes a rice planting part and a lobster breeding part. The lobster breeding part includes the steps of (1) rice field modification; (2) juvenile shrimp culture; (3) adult shrimp breeding; (4) parent shrimp putting; (5) adult shrimp fishing, supplementary juvenile shrimp putting and parent shrimp retention. The rice planting part includes the steps of (1) rice cultivation; (2) rice field management; (3) field drying; (4) rice pest and disease control; (5) draining and harvesting. Compared with an ordinary rice and lobster co-culture mode, the morbidity frequency of lobsters can be reduced to 45 days or so from 7-10 days, the disease control cost is reduced by 150 yuan / mu or so, and the survival rate can be increased to 80% or above from 30-40%.

The invention discloses a technique for rearing crayfish seedling, which is characterized in selecting and establishing a rearing field, scientifically mating and breeding, scientifically stocking juvenile prawn, scientifically rearing the juvenile prawn, managing water quality and preventing natural enemies and drug hazards. The technique for rearing the crayfish seedling has beneficial effects that: the quality of crayfishes can be improved, and popularization of the intergrowth of the crayfishes and paddies can be realized.

The invention discloses a freshwater crayfish culturing method, comprising the following steps of: a, selecting a culturing ping; b, preparing before culturing; c, putting into crayfish fingerlings; d, scientifically feeding; e, controlling water quality. According to the above manner, cultured crayfish have the advantages of being large and high in meat quality, and also have high yield and good culturing economic benefit.

The invention provides a crayfish-rice co-culture ecological culturing and breeding method. The method is characterized by particularly comprising the following steps of 1 rice field preparing, 2 rice field disinfecting, 3 aquatic plant transplanting, 4 crayfish seed stocking, 5 crayfish seed managing and 6 crayfish seed fishing. According to the method, a batch of crayfish seeds are harvested in March to April, the first batch of commercial crayfishes are harvested in April to May, and the second batch of commercial crayfishes or parent crayfishes are harvested in August to September; the culturing limitation of the prior art is reduced, ecological resources are utilized, the problem that in the existing mode, the yield is low, and the death rate is high are avoided, combined and cooperative culturing of ecological rice and crayfishes is achieved to a great extent, the crayfish culturing yield is increased, and the crayfish culturing quality is improved.

The invention belongs to the technical field of aquaculture and discloses a paddy field cultivation method for crayfish. The paddy field cultivation method is characterized by comprising the following steps of (1) paddy field preparation; (2) crayfish stocking; (3) feeding; and (4) breeding management, including the processes of (a) water quality control, (b) disease control, (c) overwintering management, and (d) catching of finished crayfish. The paddy field cultivation method for crayfish is aided by natural baits, such as hydrilla verticillata and living snails as foods for the crayfish, so that the breeding survival rate, nutrients and taste of the crayfish are improved; cyclic utilization of paddy field substances is achieved by adopting the natural bait of a paddy field ecosystem; and the breeding cost is also reduced.

The invention discloses a method of culturing lobsterlings in fresh water, comprising: excavating an enclosed culture channel at a water inlet of a rice paddy; secondly, forming a culture region around the channel by mesh, building anti-escaping facilities at the water inlet and the water outlet of the rice paddy, for preventing external infraction and self escape of shrimps seedlings; thirdly, applying enough ground fertilizer, cultivating the parent shrimp after and before transplanting rice seedlings, sterilizing the channel before pasture, planting water weeds in the channel after one week; fourthly, culturing the parent shrimp of 10-22 kg per mou, and channel density 5-25 / m2; fifthly, catching for sale. The invention method is simple, convenient in operation, low in cost, high in production and good in quality.

The invention discloses a freshwater crayfish feed for improving the meat quality. The freshwater crayfish feed is prepared from the following substances in parts by weight: 30 to 40 parts of soybean meal, 10 to 15 parts of corn meal, 8 to 10 parts of tea seed cakes, 6 to 10 parts of bone powder, 8 to 10 parts of mussels meat, 15 to 20 parts of silkworm chrysalis, 3 to 5 parts of smilacina atropurpurea, 4 to 6 parts of vallisneria natans, 2 to 4 parts of potamogeton distinctus, 5 to 8 parts of bentonite, 8 to 10 parts of sugarcane bagasse, 1 to 3 parts of composite vitamin, 1 to 2 parts of amino acid chelate, 3 to 5 parts of a Chinese herbal additive, and 4 to 6 parts of a composite additive. The feed disclosed by the invention is comprehensive and balanced in nutrition; the variety of raw materials is rich, so that the demands of freshwater crayfish in different periods for growth can be met; most of the used raw materials are pure and natural environment-friendly raw materials, and no drugs are retained in the bodies of the freshwater crayfish; the yield can be greatly increased; meanwhile, the freshwater crayfish tastes delicious and is chewy, so that a better breeding benefit is realized.

A fishing lure generally includes a body and a body extension member that extends rearwardly from the body. The body may be in the form of a grub or worm, and the body extension member may be in the form of a tail that extends from the rearward end of the body. Alternatively, the body may be in the form of a crayfish and a pair of body extension members, in the form of arms, may extend from the rearward end of the body. The body extension member includes first, second, and third portions. The first portion extends away from the body, and the second portion connects to the first portion. The third portion connects to the second portion and extends generally toward the body. The third portion includes a forwardly facing inner edge that may be linear, and the first and third portions preferably cooperate to form an acute angle.

The invention discloses a shrimp-rice co-culture breeding method. The shrimp-rice co-culture breeding method includes steps of (1), selecting lands; (2), transforming rice fields; (3), releasing juvenile shrimps; (4), constructing juvenile shrimp rearing sites; (5), carrying out feeding management in juvenile shrimp rearing phases; (6), carrying out adult shrimp breeding management; (7), cultivating rice; (8), sorting the rice fields; (9), sufficiently applying base fertilizers; (10), transplanting rice seedlings; (11), managing the rice fields; (13), draining water and carrying out harvesting. The shrimp-rice co-culture breeding method has the advantages that local rice field resources can be sufficiently utilized, and accordingly the shrimp-rice co-culture breeding method is low in cost;scientific and systematic management is carried out, and accordingly crawfishes can neatly grow and develop and are high in survival rate; the crawfishes and the rice are bred in a pollution-free manner, are high in quality and have high economic benefits; the development of the local crawfish breeding industry can be promoted; shrimp-rice system co-culture can be carried out, and accordingly theeconomic benefits can be obviously increased.

The invention discloses a method for integrated culture of rice-finless eel-crayfishp-trionyx sinensis. The method comprises the following steps: placing myriophyllum aquaticum in a ring-shaped ditchof a paddy field; putting crayfish seedlings in April or August, putting trionyx sinensis seedlings and cipangopaludina cahayensis in May, and putting finless eel seedlings in late June to early July;performing feeding; and catching crayfish in early June or early October, and catching finless eels and trionyx sinensis in November to December. According to the method for integrated culture of therice-finless eel-crayfish-trionyx sinensis, ecosystem biodiversity of the paddy field is improved, cannibalism degree of the crayfish is reduced, requirement for live baits of the finless eels and the trionyx sinensis is satisfied; and the method has the advantages of higher biological diversity, easy catching, adequate supply of live baits, more stable culture yields, higher economic benefits, and the likes.

The invention discloses a high-yield freshwater crayfish culture method. The high-yield freshwater crayfish culture method comprises the following steps: (1) selecting a regular even-bottom pond, exposing the selected pond to the blazing sun for 204 days and performing pre-treatment; (2) selecting and throwing crayfish seeds which are healthy and strong, complete in appendage, free from diseases and injuries, strong in vitality and identical in size into the pond; (3) planting aquatic plants in the aquaculture pond, placing a plurality of facilities for crayfishes to inhabit or hide in the crayfish pond; (4) regularly, qualitatively and quantitatively performing feeding; and (5) fishing for the crayfishes in 6-7 months and 11-12 months in a centralized manner, or fishing for the big and remaining the small, wherein fishing can be performed throughout the year. According to the high-yield freshwater crayfish culture method, the pond, the seed throw-in quantity, the feeding quantity and time, the water quality, fishing and the like are reasonably controlled to greatly reduce harms of natural enemies, germs and the like to the crayfishes, the crayfish survival rate and growing speed are high, the yield is high, and further, economic benefits are improved. The cultivated crayfishes are delicate in meat and delicious in taste, has rich nutrition, including protein and the like, and is unique in flavor.

The invention relates to a crayfish propagating and breeding method. The crayfish propagating and breeding method comprises the following steps of: (1), constructing a breeding pool; (2), putting parent crayfishes in a suitable place to breed; (3), feeding the parent crayfishes; (4), managing water quality; (5), propagating and hatching; (6), constructing a young crayfish culture pool; (7), putting juvenile crayfishes in a suitable place to breed; and (8), feeding the juvenile crayfishes. The crayfish propagating and breeding method disclosed by the invention is high in survival rate, high in yield and good in benefit.

The invention discloses a method for cultivating lobster in a greenhouses constructed in rice fields, and the method comprises: excavating a ring groove in the middle of the rice field as a nursery pond for crayfish, arranging an aeration, water inlet and outlet equipment, and constructing a simple plastic greenhouse on the ring groove, increasing water temperature in winter by utilizing heat preservation effect of sunlight to ensure that the crayfish can safely overwinter; constructing slope protection vegetation by using water plants such as Elodea, creating suitable cave habitat for crayfish to effectively improve the survival rate and breeding rate of the parent shrimps; feeding high-quality feed for increasing the gonad development speed of female shrimps, realizing premature spawningand hatching, achieving the purpose of commercial shrimps early entering markets and improving the yield and economic benefits of shrimp farming in rice fields.

The invention discloses a high-survival-rate cultivation method of freshwater crayfish. The cultivation method includes the steps of firstly, preparing a cultivation pond; secondly, processing before cultivation; thirdly, culturing water; fourthly, planting aquatic plants; fifthly, stocking crayfish fries; sixthly, performing daily management. The cultivation method has the advantages that the cultivation pond is elaborately designed and processed in advance, the morbidity of the crayfish is lowered from the source, the designed mud ridges, cobbles and tree roots conform to the physiological habits and needs of the crayfish, the growth of the crayfish at different time periods can be promoted, daily management such as scientific feeding and water quality adjusting is performed, the nutrition requirements of the crayfish is guaranteed, a good ecological environment is built, the survival rate of the crayfish is increased greatly, no chemical reagents and hormones are used, and the quality and nutritional value of the crayfish are guaranteed.

The invention discloses a combined method for breeding weever in a runway and intercropping crayfish in a paddy field. The method of breeding the weever in the runway and a method of breeding the crayfish in the paddy field are combined. After residual feeds and excrement of the weever in the breeding runway are centralizedly absorbed, the residual feeds and excrement are drained into the paddy field for intercropping the crayfish through pipelines, so that the crayfish takes the residual feeds, the paddy field absorbs the excrement, and the water quality is purified. Besides, the water body rich in nutritive matter like nitrogen and phosphorus is drained out of the runway, and is pumped into paddy field ditches and the paddy field through a waterwheel aerator, so that aquatic plants and rice in the paddy field ditches absorb the nutritive matter like nitrogen and phosphorous in the water body and purify the water quality. Through the combination, the water body of the paddy field becomes flowing water, the growth of the crayfish is facilitated, the waste in the breeding runway is turned into things of value, the water body of a purification area outside the runway is also fully utilized, and zero-drainage of breeding wastewater is achieved; meanwhile, land is fully utilized, and the maximal yield is achieved. It can be achieved that the annual yield of 50 mu of land is 473 Kgof rice, 229 Kg of crayfish and 51,838 Kg of the weever, and the average benefit per mu reaches 8,810 RMB.

The invention discloses an earth pond artificial propagation and breeding integrated technology for crayfishes. The earth pond artificial propagation and breeding integrated technology is characterized in that propagation and breeding are carried out in the same pond, so that both two seasons of juvenile crayfishes and two seasons of adult crayfishes can be harvested in one pond, and therefore, two seasons of juvenile crayfishes and one season of adult crayfishes are additionally harvested in comparison with crayfishes harvested by using a conventional pond breeding mode of crayfishes. According to the technical scheme adopted by the invention, the earth pond artificial propagation and breeding integrated technology for crayfishes comprises the following steps: (I) creating and modifying pond conditions; (II) preparing the pond; (III) feeding parent crayfishes; (IV) feeding the crayfishes and applying fertilizer; (V) enabling spawning, hatching and larva growing; (VI) carrying out breeding management; (VII) cultivating juvenile crayfishes; (VIII) breeding adult crayfishes; and (IX) catching adult crayfishes. Compared with the conventional pond breeding mode of crayfishes, the earth pond artificial propagation and breeding integrated technology provided by the invention has the beneficial effects that the artificial crayfish propagation is added, so that the quality and quantity of larvae bred in the pond are guaranteed; crayfish finished products come into market in advance; and the yield is increased. Thus, the economic benefits are improved.

The invention discloses a method for breeding crayfish in a paddy field and a preparation method of the crayfish, and relates to the technical field of ecological agriculture. The method comprises the following steps that firstly, the paddy field is transformed and constructed; secondly, the paddy field is cleaned and disinfected; thirdly, rice seedlings are transplanted; fourthly, crayfish fry are put into the paddy field; fifthly, feed putting is conducted; sixthly, the paddy field is fertilized; seventhly, the crayfish is caught. According to the method, crayfish breeding is more reasonable and more environmentally friendly, and is matched with paddy field cultivation to achieve the ecological recycling and symbiosis.

The invention relates to a rice-shrimp intercropping symbiotic method of single-season rice and three-season shrimps, and belongs to the technical field of ecological planting and breeding. The method comprises the steps of digging a circular furrow at the periphery of a farmland with the area of 50-60 mu, and then planting rice and water weeds in the farmland in the water weeds in an interval manner. Through building a rice field comprehensive planting and breeding ecological system, biological bait resources in the rice field can be fully utilized, the rice and the shrimps grow together, and the problems that a lot of pesticide is used for rice planting, environment is polluted by fertilizer, people health is also influenced, genetic resources are degenerated and yield is decreased due to overfishing of wild crayfish resources and backward artificial breeding technology are solved. The purposes of keeping ecological balance and increasing planting and breeding benefits are achieved.

The invention discloses a crayfish and rice intergrowth cultivation method. The method comprises rice field selection and improvement, disinfection, crayfish fry throwing, crayfish feeding, rice planting and adult crayfish fishing. The crayfish and rice are in a reciprocal symbiosis relation, the crayfish loosens soil for the rice and eliminates insect pests, the rice has the characters of absorbing N, P and other nutrient elements in a water body, has the shading function, purifies the cultivation water body and also provides an inhabiting and hiding place for the crayfish, a good growth environment is created for the crayfish, and the crayfish cultivation product quality is improved. The cultivated crayfish is fast in growth and tidy in specification while normal production of rice is not influenced, one field has two purposes, the crayfish and the rice are both harvested, and benefits are greatly increased.